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Updated: Sep 26, 2025

Synthesis of Single-Crystalline Core-Shell Metal-Organic Frameworks
Published on: February 10, 2023
Core-shell Ag@C spheres derived from Ag-MOFs with tunable ligand exchanging phase inversion for electromagnetic wave
Yihe Song1, Xuehua Liu2, Zhenguo Gao3
1School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, P. R. China.
Researchers developed tunable core-shell silver@carbon (Ag@C) electromagnetic wave absorption materials (EMAs) from metal-organic frameworks (MOFs). The materials show excellent absorption performance, with one sample achieving -50.14 dB reflection loss.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Structurally tunable electromagnetic wave absorption materials (EMAs) are crucial for advanced applications.
- Metal-organic frameworks (MOFs) offer a versatile platform for designing EMAs due to their tunable structures.
- Controllable phase inversion is a key technique for fabricating complex nanostructures.
Purpose of the Study:
- To fabricate core-shell Ag@C EMAs from Ag-MOFs using adjustable phase inversion.
- To investigate the structure-property relationships of Ag@C EMAs derived from MOF transformation.
- To achieve high-performance electromagnetic wave absorption.
Main Methods:
- Fabrication of core-shell Ag@C EMAs via continuous phase inversion of Ag-MOFs.
- Systematic modification of MOF precursors by replacing terephthalic acid with 2-methylimidazole.
- Characterization of the crystal structure and morphology of the resulting Ag@C materials.
- Evaluation of electromagnetic wave absorption properties, including reflection loss (RL) and absorption bandwidth (fE).
Main Results:
- A series of core-shell Ag@C EMAs were successfully synthesized by tuning the MOF precursor.
- The transformation from Ag-MOF-5 to ZIF-L structures influenced the crystal and morphology of Ag@C EMAs.
- One optimized sample (S2) achieved a minimum reflection loss (RLmin) of -50.14 dB at 3.0 mm thickness.
- The EMA derived from the original Ag-MOF exhibited the widest absorption bandwidth (fE) of 5.44 GHz with an RLmin of -47.36 dB at 2.2 mm.
Conclusions:
- The study demonstrates a viable method for creating tunable core-shell Ag@C EMAs from MOFs via phase inversion.
- The results highlight the importance of precursor structure control in determining EMA performance.
- This work provides insights for designing novel, high-performance electromagnetic wave absorbers.
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